1.

What is 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9?

Answer» 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45

The next number in the pattern can be identified by observing the relation between consecutive terms and their sum can be obtained by a formula.



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